Rotating endless screen belt for the medchanical purification of water.



2 Sheets-Sheet l July 20 y E. `GEIGIER ROTATING ENDLEss SCREEN BELT FOR THE MECHANICAL PURIFICATION oF WATER Filed March 5. 1926 July 2o 1926.

E. GEIGER ROTATING ENDLESS SC'IREEYI BELT FOR THE MECHANICAL PURIFICATION OF WATER 2 Sheets-Sheet V2 Filed March 5, 1,926

/NVENTR Q6 2% Y l i Cab CII

Patented July 20, 1926.

UN'FCED STATES 1593,]69 PTET QFFCE.

EUGEN GEIGER, OF KARLSRUHE, GERMANY.

ROTATING 'ENDLESS SCREEN BELT EUR THE MECHANICAL PUQR'IIEICA'IION` 0F 'WATER/ Application :filed March 5, 1926, Serial No. 92,630, and in Germany March 7, 1925.

My invention relates to rotating endless screen belts for the mechanical purification of water, built up of a number oi screen sections tightly held in suitable frames that are carried on both sides by an endless chain. It is known to remove from the belt' the impurities deposited thereon by spraying oli the same with water under pressure issuing in line jets from a pipe provided horizontally behind the upper end ol the front part of the beit and flowing forwardly through the screens. The spraying water meets not only with the free screen surface of the rotating belt but also with the cross members of the screen trames which do not allow the Water to pass through but stray or scatter it unnecessarily. The strayed water meets also with the screen sections that have not yet been lifted over the trough arranged in front of the upper end of the front part of the belt and serv ing to catch, collect and carry away the impurities sprayed oil from the same, thus prematurely rinsing away the impurities der posited on these sections. This involves not only an undue loss oi' spraying water but also a disturbance of the purifying operation. To avoid this disadvantageous e'ect, I provide means for automatically throttling the spraying water during the passage of the cross members of the screen trames in front of the spraying pipe.

The accompanying drawings illustrate a form of construction of the apparatus embodying my invention, Fig. 1 showing the upper end of the screen belt with a part or one of the two upper chain wheels, the spraying device and the collecting trough in side elevation, partly in vertical section, Fig. 2 showing one of the upper chain wheels with the spraying device in front elevation, and Fig. 3 showing parts ot' one of the upper chain wheels and of the spraying device on a larger scale in side elevation, partly in section.

For spraying off from the screen belt a the impurities deposited thereon there are provided two pipes l) and c for water under pressure, one oi which, In, lies immediately and horizontally behind the upper end oi the front part of the belt and sends fine jets of water issuing through small holes provided in two series in its iront horizone tally and outwardly through the screen passing in front of it, whilst the second pipe c lies immediately and horizontally in iront Vof the said belt end and at a certain distance above the first pipe and sends vtine jets of water issuing through a series of holes provided in its bottom downwardly along the belt.

Into the supplyV pipe d leading to the inner pipe ZJ there is inserted a balanced valve c which is held in the open position by spring pressure. The casing or this valve supports a bracket in which a double armed lever f is ulcrumed. One end of this lever 1s jointed to the spindle g of the valve e, whilst the other end carries a roller Zz. This roller runs upon' the periphery of one of the two upper chain wheels i guiding the belt a. rIhe periphery of this chain wheel is provided with a number of cams 7c, the

distance of which corresponds to that of.

the cross members Z of the screen frames, and the length of which in the direction of the periphery corresponds to the width of these iframe members. The said cams are disposed in such manner that always immediately before the arrival of the lower cross member Z of one screen section below the spraying pipey Z9 one of the cams runs upon the roller It, thus raising the body of the valve e into the closed position by means of the lever f and the spindle g, and that immediately after the passage of the upper cross member Z of the following screen section in front of the pipe Z) the said cam runs oil again from the roller 7L, thus allowing the valve e to open again under the spring pressure. In this manner always during the passage of two neighboring trame members Z in front of the series of holes in the pipe Z) the supply of water to this pipe is automatically stopped and thus the spraying action of this pipe on the belt a is interrupted, whereby straying or scattering of spraying water is prevented and saving of water under pressure is obtained. The jets of spraying water issuing from the outer pipe c and continually spraying the belt from above cleanse also that parts` of the screen sections which are not struck by the jets issuing from the inner pipe Z).

lhat I claim as my invention and desire to secure by Letters Patent is:

l.. In a rotating endless screen belt for the mechanical purification of water, having a Jfront and a rear part and being built up of a number of screen sections, in combination with a number of frames holding said screen sections and having cross members, a

spraying pipe provided behind the upper end of the front part of the belt, means for supplying Water under pressure to seid spraying pipe, and means for automatically throttling the Water supply during the piissilge *of saidl`Cross members of seid frames in front of Ksaid spraying pipe.

2. In a' 'rotating endless screen `rbelt Yfor the mechanieal puriieation of Waiter, having` i front and zi rezir p21-rtl and being built up of e number of screen sections, in combination with a number or' trames holding said screen sections and having cross vmem.- bers7 two endless chains Carrying said Aframes on Vbeth sidesV and yrunningover, chain Wheels, the' periphery oi 'one'of selifd chain Wheels being' provided with e vmifmber off cams the distance of Which corresponds to that of said cross members and the length of which eerresponds to the Width of seid cross members, e spraying pipe provided behind the upper end of the iront part ot the belt, s.. supply pipe for Water under pressure leading to seid spraying pipe?, LL valve inserted into saidl supply pipe and held in the open position by spring pressure, means provided on said valve and adapted to be operated'by said cams so as to close said Valve during the passage of seid cross members in 'liront of said sprziyingpipe.

In testimony ywhereof I allii: my signeture.

DR. EUGEN GEGER. 

